;
(function(root, factory) {
	if (typeof define === 'function' && define.amd) {
		define(factory)
	} else if (typeof exports === 'object') {
		module.exports = factory()
	} else {
		root.NProgress = factory()
	}
})(this, function() {
	var NProgress = {};
	NProgress.version = '0.2.0';
	var Settings = NProgress.settings = {
		minimum: 0.08,
		easing: 'ease',
		positionUsing: '',
		speed: 200,
		trickle: true,
		trickleRate: 0.02,
		trickleSpeed: 800,
		showSpinner: true,
		barSelector: '[role="bar"]',
		spinnerSelector: '[role="spinner"]',
		parent: 'body',
		template: '<div class="bar" role="bar"><div class="peg"></div></div><div class="spinner" role="spinner"><div class="spinner-icon"></div></div>'
	};
	NProgress.configure = function(options) {
		var key, value;
		for (key in options) {
			value = options[key];
			if (value !== undefined && options.hasOwnProperty(key)) Settings[key] = value
		}
		return this
	};
	NProgress.status = null;
	NProgress.set = function(n) {
		var started = NProgress.isStarted();
		n = clamp(n, Settings.minimum, 1);
		NProgress.status = (n === 1 ? null : n);
		var progress = NProgress.render(!started),
			bar = progress.querySelector(Settings.barSelector),
			speed = Settings.speed,
			ease = Settings.easing;
		progress.offsetWidth;
		queue(function(next) {
			if (Settings.positionUsing === '') Settings.positionUsing = NProgress.getPositioningCSS();
			css(bar, barPositionCSS(n, speed, ease));
			if (n === 1) {
				css(progress, {
					transition: 'none',
					opacity: 1
				});
				progress.offsetWidth;
				setTimeout(function() {
					css(progress, {
						transition: 'all ' + speed + 'ms linear',
						opacity: 0
					});
					setTimeout(function() {
						NProgress.remove();
						next()
					}, speed)
				}, speed)
			} else {
				setTimeout(next, speed)
			}
		});
		return this
	};
	NProgress.isStarted = function() {
		return typeof NProgress.status === 'number'
	};
	NProgress.start = function() {
		if (!NProgress.status) NProgress.set(0);
		var work = function() {
				setTimeout(function() {
					if (!NProgress.status) return;
					NProgress.trickle();
					work()
				}, Settings.trickleSpeed)
			};
		if (Settings.trickle) work();
		return this
	};
	NProgress.done = function(force) {
		if (!force && !NProgress.status) return this;
		return NProgress.inc(0.3 + 0.5 * Math.random()).set(1)
	};
	NProgress.inc = function(amount) {
		var n = NProgress.status;
		if (!n) {
			return NProgress.start()
		} else {
			if (typeof amount !== 'number') {
				amount = (1 - n) * clamp(Math.random() * n, 0.1, 0.95)
			}
			n = clamp(n + amount, 0, 0.994);
			return NProgress.set(n)
		}
	};
	NProgress.trickle = function() {
		return NProgress.inc(Math.random() * Settings.trickleRate)
	};
	(function() {
		var initial = 0,
			current = 0;
		NProgress.promise = function(p) {
			if (!p || p.state() === "resolved") {
				return this
			}
			if (current === 0) {
				NProgress.start()
			}
			initial++;
			current++;
			p.always(function() {
				current--;
				if (current === 0) {
					initial = 0;
					NProgress.done()
				} else {
					NProgress.set((initial - current) / initial)
				}
			});
			return this
		}
	})();
	NProgress.render = function(fromStart) {
		if (NProgress.isRendered()) return document.getElementById('nprogress');
		addClass(document.documentElement, 'nprogress-busy');
		var progress = document.createElement('div');
		progress.id = 'nprogress';
		progress.innerHTML = Settings.template;
		var bar = progress.querySelector(Settings.barSelector),
			perc = fromStart ? '-100' : toBarPerc(NProgress.status || 0),
			parent = document.querySelector(Settings.parent),
			spinner;
		css(bar, {
			transition: 'all 0 linear',
			transform: 'translate3d(' + perc + '%,0,0)'
		});
		if (!Settings.showSpinner) {
			spinner = progress.querySelector(Settings.spinnerSelector);
			spinner && removeElement(spinner)
		}
		if (parent != document.body) {
			addClass(parent, 'nprogress-custom-parent')
		}
		parent.appendChild(progress);
		return progress
	};
	NProgress.remove = function() {
		removeClass(document.documentElement, 'nprogress-busy');
		removeClass(document.querySelector(Settings.parent), 'nprogress-custom-parent');
		var progress = document.getElementById('nprogress');
		progress && removeElement(progress)
	};
	NProgress.isRendered = function() {
		return !!document.getElementById('nprogress')
	};
	NProgress.getPositioningCSS = function() {
		var bodyStyle = document.body.style;
		var vendorPrefix = ('WebkitTransform' in bodyStyle) ? 'Webkit' : ('MozTransform' in bodyStyle) ? 'Moz' : ('msTransform' in bodyStyle) ? 'ms' : ('OTransform' in bodyStyle) ? 'O' : '';
		if (vendorPrefix + 'Perspective' in bodyStyle) {
			return 'translate3d'
		} else if (vendorPrefix + 'Transform' in bodyStyle) {
			return 'translate'
		} else {
			return 'margin'
		}
	};

	function clamp(n, min, max) {
		if (n < min) return min;
		if (n > max) return max;
		return n
	}

	function toBarPerc(n) {
		return (-1 + n) * 100
	}

	function barPositionCSS(n, speed, ease) {
		var barCSS;
		if (Settings.positionUsing === 'translate3d') {
			barCSS = {
				transform: 'translate3d(' + toBarPerc(n) + '%,0,0)'
			}
		} else if (Settings.positionUsing === 'translate') {
			barCSS = {
				transform: 'translate(' + toBarPerc(n) + '%,0)'
			}
		} else {
			barCSS = {
				'margin-left': toBarPerc(n) + '%'
			}
		}
		barCSS.transition = 'all ' + speed + 'ms ' + ease;
		return barCSS
	}
	var queue = (function() {
		var pending = [];

		function next() {
			var fn = pending.shift();
			if (fn) {
				fn(next)
			}
		}
		return function(fn) {
			pending.push(fn);
			if (pending.length == 1) next()
		}
	})();
	var css = (function() {
		var cssPrefixes = ['Webkit', 'O', 'Moz', 'ms'],
			cssProps = {};

		function camelCase(string) {
			return string.replace(/^-ms-/, 'ms-').replace(/-([\da-z])/gi, function(match, letter) {
				return letter.toUpperCase()
			})
		}

		function getVendorProp(name) {
			var style = document.body.style;
			if (name in style) return name;
			var i = cssPrefixes.length,
				capName = name.charAt(0).toUpperCase() + name.slice(1),
				vendorName;
			while (i--) {
				vendorName = cssPrefixes[i] + capName;
				if (vendorName in style) return vendorName
			}
			return name
		}

		function getStyleProp(name) {
			name = camelCase(name);
			return cssProps[name] || (cssProps[name] = getVendorProp(name))
		}

		function applyCss(element, prop, value) {
			prop = getStyleProp(prop);
			element.style[prop] = value
		}
		return function(element, properties) {
			var args = arguments,
				prop, value;
			if (args.length == 2) {
				for (prop in properties) {
					value = properties[prop];
					if (value !== undefined && properties.hasOwnProperty(prop)) applyCss(element, prop, value)
				}
			} else {
				applyCss(element, args[1], args[2])
			}
		}
	})();

	function hasClass(element, name) {
		var list = typeof element == 'string' ? element : classList(element);
		return list.indexOf(' ' + name + ' ') >= 0
	}

	function addClass(element, name) {
		var oldList = classList(element),
			newList = oldList + name;
		if (hasClass(oldList, name)) return;
		element.className = newList.substring(1)
	}

	function removeClass(element, name) {
		var oldList = classList(element),
			newList;
		if (!hasClass(element, name)) return;
		newList = oldList.replace(' ' + name + ' ', ' ');
		element.className = newList.substring(1, newList.length - 1)
	}

	function classList(element) {
		return (' ' + (element.className || '') + ' ').replace(/\s+/gi, ' ')
	}

	function removeElement(element) {
		element && element.parentNode && element.parentNode.removeChild(element)
	}
	return NProgress
});